If you click the little person-shaped icon in the top corner (right between the help button and the private messages button), you will see a little popup with several links. One is User Control Panel. Click that, and in the User Control Panel you will see a tab named Overview. Right beside this is a hamburger icon. Clicking that, you can select other tabs, one of which is Board preferences. Then you will see a button in that section called Edit notification options. Here you can check the box in the email column for Someone replies to a topic to which you are subscribed

derz00,
Thank you for the prompt reply.
I had previously set "Someone replies to a topic to which you are subscribed" to Email.
I then checked which forums I was subscribed to, it indicates none.
Apparently the forum is NOT subscribing me to any forums by default.
I could not find anyway to manually subscribe to any forum.
Further Help will be appreciated.

I'm not sure what exactly the situation is, I actually asked a question re. this recently, but I've done some inventions just now.

To get notifications, you may need to subscribe to threads individually, I'm not sure if you can blanket specify 'notify me re. threads that feature me in a particular forum'. So the best workaround would be to subscribe to every thread you're in, by automatically ticking 'Notify me when a reply is posted', which is present when you click 'Full Editor & Preview'.

This should probably work to subscribe to every new thread automatically (to automatically tick 'Notify me when a reply is posted'):
click person-shaped icon in top-right corner,
User Control Panel,
Board preferences tab,
Edit posting defaults,
Notify me upon replies by default

I have tried all of the above but my account still says I am NOT subscribed to any forum and I am not getting any email notification when someone replies.
Maybe I have done something in my account I shouldn't have.
In any case I still have no idea how to get subscribed to any forum so I will get email notifications.
The forum's software, in my case, is obviously NOT automatically subscribing me when I have previously asked for help in the forum.

Notify on replies was not enabled on your account. You may think that you saved it but you did not. I have enabled it. Subscribe works for everyone else I have a hard time believing that it doesn't work for you please check and verify your email address on your account